Callao-B (Peru) Site History

History Summary

Station Name Callao-B
Country Peru
Latitude 12° 03.0' S
Longitude 077° 09.0' W
GLOSS No. 173
Time Reference GMT (hours 00-23)
Contributor Direccion Hidrografia y Navegacion de la Marina Callao, Peru
Instrument Type Standard mechanical tide gauge (ANA) (1971-)
Leupold Stevens analog-to-digital recorder (ADR) (5/1985-);
ADR received via satellite at the Univ. of Hawaii (SDR)
Handar Encoder (ENC) model 436A (5/1985-) also received at the Univ. of Hawaii via satellite
Site of Gauge  
Observational Period 1970-1994

Reference Level

The data have been linked to tide staff zero by the contributors. However, further analysis of the data has lead to adjustments of the reference level in separate segments. The following adjustments were justified by reanalysis of the tide staff observation sheets and/or by comparisons of the analog data to analog-to-digital Leupold Stevens data performed by Mr. Henry Pittock of Oregon State University.

Period ((hour)day/month/year) Value Added to
Original (mm)
(18)12/09/79 - (12)01/10/79 -76
(05)01/05/83 - (13)01/06/83 61
(14)30/05/85 - (04)01/07/85 -30
(14)01/08/85 - (18)28/08/85 -45
(19)28/08/85 - (04)01/09/85 30
(17)03/03/86 - (17)29/04/86 30
(14)03/06/86 - (17)02/07/86 30
*(05)01/11/86 - (05)01/03/87 -30

*adjustment determined by comparisons of the analog with SDR and ENC data

All adjustments above are uncertain to a few cm. Since January 1989, the reference levels of the ENC and SDR have been monitored by an automated reference level switch (for more information, contact the UH Sea Level Center).

Quality Assessment by the UH Sea Level Center

Comment

The earthquake of 3 October 1974 is associated with a sea level rise of about 10 cm followed by a period of resettlement. Dr. Klaus Wyrtki of the Univ. of Hawaii has prepared an unpublished report on the effects of this quake on the sea level signal.

For the period from 1987 to the present, the analog, ENC, and SDR series were analysed simulataneously and the data in the final archive are a composite based on the best data for each time period summarized as follows:

Period (day/month/year) Source Adjustments to
Original (mm)
01/03/87 - 14/07/87 ANA none
15/07/87 - 15/12/88 ENC none
16/12/88 - 30/06/89 ANA +30
01/07/89 - 25/10/89 ENC none
26/10/89 - 20/05/90 SDR none
21/05/90 - 30/11/92 ENC none
01/12/92 - 31/12/92 ANA -30
01/01/93 - 30/04/94 ENC none

From 18 August to 30 November 1992, numerous short gaps have been interpolated using residuals and the predicted tides. The uncertainty of the daily values is about ±3 cm. The '#' below denotes ENC data gap filled with ANA data. A separate series Callao-A exists with data for 1950-1965. These data are of good quality. The series appear on different levels and information for linking them is not available.

Year CI(%) Missing Data Replaced Gaps or Bad Data Questionable Fluctuations
1970 99 1 none none
1971 100 none none none
1972 100 none none none
1973 100 none none none
1974 100 none none none
1975 100 none none none
1976 100 none none none
1977 100 none none none
1978 100 none none none
1979 100 none none none
1980 100 none none none
1981 100 none none none
1982 100 none none 144-149,243,245,254-255,258-265,293-294,332-333
1983 100 none none 82,206,279
1984 100 none none none
1985 100 none none 94-95,150-151,298-299
1986 100 none (05)345-(20)345 83-85,124,174,320-321,334
1987 100 none (09)210-(16)210 (22)344-(08)345 15-16,29-30,33,44-45,47-48,90,105-106,119
1988 100 none (06)092-(13)092 (09)105-(01)106 (17)214-(00)215 (01)255-(12)255 none
1989 100 none none none
1990 100 none (13)209-(20)209 (05)267-(16)267 (21)282-(04)283 (15)303-(22)303 none
1991 100 none (11)025-(18)025 (19)233-(02)234 none
1992 100 none (01)201-(10)201 (00)203-(10)203 (07)206-(14)206 (02)207-(10)207 (03)228-(10)228 (03)230-(10)230 (03)231-(10)231 (03)232-(10)232 (03)233-(10)233 (03)236-(10)236 (23)236-(14)237 (23)237-(10)238 (23)238-(10)239 (23)239-(14)240 (23)240-(10)241 (23)241-(10)242 (03)243-(10)243 (03)244-(10)244 (01)245-(10)245 (23)245-(10)246 (23)246-(14)247 (23)237-(14)248 (23)248-(10)249 (23)249-(10)250 (03)251-(14)251 (23)251-(10)252 (23)252-(10)253 (03)255-(10)255 (03)256-(10)256 (03)257-(10)257 (03)258-(10)258 (23)258-(10)259 (03)261-(10)261 (03)262-(10)262 (23)262-(10)263 (23)263-(10)264 (23)264-(10)265 (23)265-(10)266 (23)266-(10)267 (23)267-(10)268 (03)269-(10)269 (23)269-(10)270 (23)270-(10)271 (23)271-(10)272 (23)272-(10)273 (23)273-(10)274 (03)275-(10)275 (03)277-(10)277 (03)278-(10)278 (23)278-(10)279 (23)279-(10)280 (23)280-(10)281 (23)281-(10)282 (23)282-(10)283 (23)283-(10)284 (23)284-(10)285 (23)285-(10)286 (23)286-(10)287 (19)287-(10)288 (23)288-(10)289 (23)289-(10)290 (23)290-(10)291 (23)291-(10)292 (23)292-(10)293 (23)293-(10)294 (23)294-(10)295 (19)295-(10)296 (23)296-(10)297 (23)297-(10)298 (23)298-(10)299 (23)299-(10)300 (23)300-(10)301 (23)301-(10)302 (19)302-(10)303 (23)303-(10)304 (19)304-(10)305 (19)305-(23)305 (01)306-(10)306 (19)306-(10)307 (19)307-(10)308 (19)308-(10)309 (19)309-(10)310 (19)310-(10)311 (19)311-(10)312 (19)312-(10)313 (19)313-(10)314 (19)314-(14)315 (19)315-(14)316 (19)316-(10)317 (16)317-(10)318 (19)318-(10)319 (19)319-(10)320 (19)320-(10)321 (16)321-(10)322 (19)322-(10)323 (18)323-(10)324 (19)324-(10)325 (19)325-(10)326 (19)326-(10)327 (12)327-(10)328 (15)328-(10)329 (16)329-(10)330 (16)330-(10)331 (17)331-(10)332 (19)332-(10)333 (20)333-(10)334 (23)334-(10)335 none
1993 100 none #(03)289-(23)294 none
1994 33 none none none